US6606495B1 - Method and arrangement for wireless communication by means of at least two network computers - Google Patents

Method and arrangement for wireless communication by means of at least two network computers Download PDF

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Publication number
US6606495B1
US6606495B1 US09/398,682 US39868299A US6606495B1 US 6606495 B1 US6606495 B1 US 6606495B1 US 39868299 A US39868299 A US 39868299A US 6606495 B1 US6606495 B1 US 6606495B1
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terminal device
wireless terminal
wireless
network computer
connection
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Markku Korpi
Stefan Karapetkov
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Enterprise Systems Technologies SARL
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Siemens AG
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/06—Registration at serving network Location Register, VLR or user mobility server

Definitions

  • the present invention relates to a method and an arrangement to provide a connection to a wireless terminal device depending on a location thereof such that, for the connection setup, a network computer is automatically contacted in whose wireless communication range the wireless terminal device currently resides, even if the connection code of another network computer has been entered by a communication subscriber that desires a connection to this wireless terminal device.
  • the DECT standard Digital Enhanced Wireless Telephone
  • base station Radio Fixed Part
  • terminal device portable part
  • base stations whose wireless communication ranges mutually overlap or at least adjoin one another.
  • base stations To cover very large surface areas for the wireless communication, such as are represented by expanded industrial parks or cities, it is frequently necessary to provide base stations at a variety of network computers, in order to have available a sufficiently large wireless communication range for applications of this kind.
  • the system structure of communication arrangements such as this and the communication methods used must guarantee that, given the moving of a wireless terminal device through the various wireless communication areas, it is assured that problems involving the stability of the connection do not arise in the wireless communication in the transition between these communication areas. This wandering thorough different wireless communication areas is known as roaming in the professional jargon. In particular, given roaming of this kind, it must be guaranteed that a wireless terminal device which is normally reachable via a communication code in the form of a telephone number, which switches a connection through to this device via a specific network computer, is also reachable if it is located in the wireless communication region of the base station of another network computer which can be reached via a different telephone number.
  • This problem is solved in a communication system of the HICOM 300 type, currently marketed by Siemens AG, by a specific assembly that is present in each network computer. This assembly guarantees by network-wide communication that a wireless terminal device can roam arbitrarily.
  • An object of the present invention is to provide a method and an arrangement which combine the usability of optimally universal network computers, which execute pure switching functions only, with the required functions for the wide-area roaming of wireless terminal devices.
  • This object is achieved in accordance with the invention in a method wherein it is determined, via a mobility server having wireless connection information about a first wireless terminal device, having a first communication code for enabling a communication connection to a first network computer, whether the first wireless terminal device is located in a first wireless communication area of the first network computer.
  • a wireless connection of said first wireless terminal device is set up to the first network computer upon determining that the first wireless terminal device is located in the first wireless communication area.
  • a wireless connection of the first wireless terminal device is set up to the first network computer via a second network computer, having a second wireless communication area within which the first wireless-terminal device is located, using the wireless connection information, upon determining the first wireless terminal device not being located in the said first wireless communication area.
  • wireless connection information for a wireless terminal device is advantageously held ready in a mobility server, and a connection to the wireless terminal device is produced by means of this wireless connection information.
  • the wireless terminal device can still be reached via that computer in whose wireless communication region it is located, even if a communication subscriber who wishes to establish the connection to this wireless terminal device dials the number of a different network computer.
  • the mobility server advantageously controls the setup of the wireless connection by means of the connection information, because it is possible in this way to use standard interfaces for the influencing of the switching process on the network computer, and because the technical outlay for implementing the method is kept low.
  • an item of identification information is delivered by the wireless terminal device, which can be received by a base station at a respective network computer.
  • a connection message can be generated by simple means, via which connection message the network computer via whose communication code this wireless terminal device can usually be reached learns the connection path via which a connection to the wireless terminal device can be currently set up.
  • the wireless connection information in the mobility server is advantageously updated with the aid of the connection message that has been forwarded by one network computer to another network computer. This guarantees, in a technically and constructionally simple manner, the constant reachability of the wireless terminal device, regardless of its location.
  • performance features of the respective wireless terminal device are advantageously loaded in a performance feature server, which controls the network computer depending on activated performance features.
  • a performance feature server which controls the network computer depending on activated performance features.
  • a check is advantageously made, prior to the setup of a connection to the wireless terminal device, as to whether a performance feature has been activated which renders the connection setup to this wireless terminal device superfluous, such as call forwarding to a secretary or the activation of a mailbox (which can be realized in the respective home network computer).
  • the connection request and the communication line which transmits this connection request arrive thereat.
  • this prevents the network load from increasing due to the setup of unneeded connections, and on the other hand, it guarantees a high flexibility with reference to the use of a wide variety of performance features.
  • different network computers whose wireless communication areas border one another are advantageously combined into a group. In this way unrestricted movement of the wireless terminal equipment within the wireless communication areas of these network computers is possible.
  • the method also guarantees that the wireless terminal device can be reached at all times. This method also enables the establishment of private and public wireless communication areas of arbitrary size.
  • an arrangement comprising at least two network computers that are connected to each other; a mobility server, which is connected to a network computer, contains connection information to a wireless terminal device; and a wireless terminal device.
  • This arrangement represents the minimal configuration with which the object of the invention is achieved and with which the ability to reach the wireless terminal device via the setup of a connection by means of the mobility server is guaranteed. This arrangement is attractive, because it solves the problem of the invention using technically simple means.
  • means are provided for delivering identity information and for receiving such information as delivered by the wireless terminal device, from which information, in connection with connection information of the respective network computer, additional means generate a connection message, which can be forwarded to other network computers and which guarantees the reachability of the wireless terminal device.
  • This arrangement and these means easily guarantee the reachability of the wireless terminal device within a wide variety of wireless communication areas of different network computers, via a single communication code of a home network computer of this wireless terminal device.
  • a performance feature server which makes available a wide variety of performance features for the wireless terminal device and which controls the network computer depending on these performance features.
  • network computers which only have switching functions, and at the same time to realize and display a wide variety of performance features for the wireless terminal devices, thereby making available a highly flexible universally usable communication arrangement.
  • FIG. 1 is a schematic block diagram of a first embodiment of a communication arrangement having a performance feature server and a mobility server at the same network computer.
  • FIG. 2 is a schematic block diagram of a second embodiment of a communication arrangement having the performance feature server at one network computer and the mobility server at another network computer.
  • FIG. 3 is a schematic block diagram of a communication arrangement having the mobility server at a network computer and the performance feature server in the wireless terminal device.
  • FIG. 4 is a schematic block diagram of a communication arrangement having two mobility servers and one performance feature sever.
  • FIG. 5 is a schematic block diagram of a communication arrangement having two mobility servers and a performance server in the wireless terminal device.
  • FIG. 6 is a schematic block diagram of an arrangement having a performance feature server and mobility server at a network computer.
  • FIG. 1 depicts a first communication arrangement with network computers VR 1 to VR 3 , a performance feature server LMS, a mobility server MS, a wireless terminal device PP, and base stations BS 1 and BS 2 , which are connected to the respective network computers VR 1 to VR 3 and which comprise the wireless communication areas Z 1 and Z 2 , in which it is possible to establish a radio connection FS.
  • a communication terminal device KE is illustrated, which sets up a communication connection to the wireless terminal device PP.
  • This communication terminal device KE can be a matter not only of a wireless terminal device, but also of a wirebound terminal device. Connections 10 to 40 as well as CTI 1 and CTI 2 are provided between the individual components of these communication arrangements.
  • the wireless terminal device PP can be reached at the network computer VR 2 in that a port extension to the base station BS 2 from the network computer VR 1 is performed.
  • the connection request of KE now reaches the network computer VR 1 on 30 .
  • the mobility server MS is interrogated with respect to the wireless connection information of PP via the connection line 50 .
  • PP is not located in the wireless communication area of VR 1 at the moment, but is located in the wireless communication area of VR 2 and can be reached via the base station BS 2 in the wireless communication area Z 2 .
  • the network computer VR 1 sets up the connection to VR 2 via 40 and 50 to BS 2 , under the control of the mobility server MS.
  • A-connection from KE reaches the network computers (switching computers) VR 1 and VR 2 , for example private branch exchanges, via a public network computer VR 3 .
  • a connection may thus be set up transparently by the network computers VR 1 and VR 2 .
  • the connection setup is controlled by the wireless connection information, which is held ready in the mobility server MS.
  • the network computer is preferably controlled via the standardized interface for computer telephone integration (CTI).
  • CTI computer telephone integration
  • CTI is a matter of a general term for the communication between computer and network computer.
  • the most popular standard for CTI is CSTA (Computer Supported Telecommunications Applications). But there are also proprietary solutions, such as ACL (Application Connectivity Link).
  • ACL Application Connectivity Link
  • Identity information is preferably delivered by the wireless terminal device PP and forwarded—here, to the base station BS 2 —via the radio path FS.
  • the network computer VR 2 sends this identity information, together with its own connection data, to other network computers in the form of a connection message; in this case to VR 1 , which can use this connection message to update the wireless connection information in its mobility servers MS.
  • this case can arise when the wireless terminal device PP changes from one wireless communication area Z 1 , of the base station BS 1 and the network computer VR 1 , to a wireless communication area Z 2 , of the base station BS 2 and the network computer VR 2 .
  • the connection message and the wireless connection information in the mobility server MS can be compared cyclically, and if a discrepancy arises, the current information can be entered in the mobility server MS.
  • Performance features for PP are made available by the performance feature server LMS, which is connected to VR 1 via the interface CTI 2 .
  • Such performance features can contain call forwarding, the activation of a mailbox, or the displaying of toll units, for example.
  • it can be ensured by an appropriate procedure that, for example, a port extension is not activated if a call forwarding or the activation of a mailbox has been switched on.
  • performance features are checked by the proposed method in a prioritized manner, and only such wireless connections are set up whose setup does not conflict with activated performance features.
  • FIG. 1 makes possible extension connections in the form of a port extension, a call extension or a prolonging connection.
  • Home services of the network computer VR 1 are thus also available to other network computers, such as the network computer VR 2 .
  • This type of arrangement offers an added advantage, since it is possible to use keyboard protocols or stimulus protocols that are simple and easy to realize for the controlling of the wireless terminal devices PP in conjunction with the performance feature server LMS.
  • the IPUI International Portable User Identity
  • additional data can also be contained in a user profile, which data can be filed in a database on the mobility server MS.
  • the wireless terminal device PP is not located in the wireless communication area Z 2 of the base station BS 2 of the network computer VR 2 , as it is here, but rather in the wireless communication area Z 1 of the base station BS 1 at the network computer VR 1 , then the setup of the wireless connection to PP by the network computer VR 1 is controlled by the mobility server MS via the wireless connection information.
  • the performance feature server LMS can also be connected to the network computer VR 2 via the interface CTI 2 .
  • the communication subscriber can be reached at the wireless terminal device PP via the network computer VR 1 .
  • the wireless connection information is made available by the mobility server MS, which is connected at the network computer VR 1 via the interface CTI 1 .
  • all reference characters that are the same relate to components of the arrangement with the same function throughout the different Figures.
  • a call for the wireless terminal device PP coming in at the network computer VR 1 is extended by the mobility server MS to the destination (here the destination is VR 2 ). Also, calls going out of the wireless terminal device PP are first connected through to the network computer VR 1 via connections 47 and 40 and are then routed to the requested destination. The incoming/outgoing calls in the network computer VR are thus switched in the performance feature server LMS or in the mobility server MS. Only signaling information such as the destination address is transmitted to the mobility server MS, whereby the CTI interface is preferably used. Using this destination address, the mobility server MS can then ascertain—namely, by comparing the stored data—whether the wireless terminal device PP is located in the wireless communication area Z 1 or in the wireless communication area Z 2 .
  • the mobility server MS prompts the network computer to set up a connection to the wireless terminal device PP.
  • the performance features of the wireless terminal device PP are made available by a performance feature server LMS that is connected to the network computer VR 2 .
  • performance feature servers LMS which are connected to different network computers VR 1 , VR 2 may differ with respect to the loaded and available performance features, it is possible for different performance features to be available within the wireless communication area Z 1 and within the wireless communication area Z 2 . This is true only if, in contrast to the illustration in FIG. 2, a respective performance feature server LMS is connected to the different network computers VR 1 , VR 2 , and the respective performance feature servers make a different spectrum of performance features available to the different network computers VR 1 ,VR 2 .
  • FIG. 3 illustrates another arrangement for wireless communication by means of two network computers VR 1 , VR 2 , in which arrangement the performance feature server is integrated in the wireless terminal device PP.
  • the mobility server MS is additionally connected at the network computer VR 1 , for incoming calls from KE (one such call is referenced 30 here), an extension is accordingly executed from this network computer VR 1 to the corresponding network computer (here VR 2 ), according to the wireless connection information in the mobility server MS.
  • the information about performance features of the wireless terminal device PP is transmitted to the wireless terminal device PP via an extension connection port extension CTI 2 , which runs through the base station BS 2 .
  • connection path CTI 2 represents only one logical connection and does not symbolize two radio pathways, as might be mistakenly derived from the illustration.
  • the connection CTI 2 can be contained in the radio pathway FS, accordingly.
  • FIG. 4 illustrates, other arrangements are provided in other communication networks which support call rerouting instead of port extension.
  • Two mobility servers MS and MS 2 are used in this case.
  • the wireless connection information in MS is interrogated via trunk lines 70 and 75 , bypassing the network computer VR 1 , and a connection is switched through directly from the network computer VR 3 to VR 2 , bypassing VR 1 .
  • This connection is referenced 35 in FIG. 4 .
  • the network computer VR 2 is controlled by the mobility server MS 2 , which likewise makes available the wireless connection information. This forwards the call via 35 to the base station BS 2 , and via this to the wireless terminal device PP.
  • information about the performance features of the wireless terminal device PP is forwarded to the performance feature server LMS from the network computer VR 2 via CTI 2 .
  • LMS controls the network computer VR 2 and thus specifies which performance features can be realized at the wireless terminal device PP. Because a connection extension to the network computer VR 1 does not ensue in this case, only such performance features can be activated from the wireless terminal device PP as are provided in the performance feature server LMS.
  • FIG. 5 illustrates the case in which the performance feature server is realized in the wireless terminal device PP.
  • This can be applied to the case where the network does not support port extension, but rerouting.
  • the same ideas apply as were outlined in the arrangement in FIG. 4 .
  • the wireless terminal device PP it is guaranteed in this case that the wireless terminal device PP has available to it the same performance feature spectrum in every wireless communication area of every network computer VR 1 , VR 2 , VR 3 , because the performance feature server is integrated in the wireless terminal device, and the performance features are controlled in the network computer VR 2 by the wireless terminal device via CTI 2 .
  • a technical realization of the invention is realized in a conventional communication system using a standard assembly SLMC, for example.
  • the mobility functions and the performance features are controlled by one mobility server MS and one performance feature server LMS via CTI interfaces CTI 1 and CTI 2 at the assembly SLMC.
  • This assembly then takes over the setup of the port extension to another network computer only according to the wireless connection information in the mobility server MS (the extension is illustrated here as connection 40 to the network computer VR 2 ).
  • the CTI interface can be realized via a V. 24 connection, which is typically already present at the network computer VR 1 .
  • a computer PC can be interfaced via data lines 210 to a data network INT, which is interfaced to the performance feature server LMS via another line 100 .
  • the loading of performance features onto LMS can likewise be controlled by the computer via ST.

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US09/398,682 1998-09-18 1999-09-20 Method and arrangement for wireless communication by means of at least two network computers Expired - Lifetime US6606495B1 (en)

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